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Andrey Simakov – One of the best experts on this subject based on the ideXlab platform.

  • highly active au ceo2 zro2 yolk shell nanoreactors for the reduction of 4 nitrophenol to 4 Aminophenol
    Applied Catalysis B-environmental, 2015
    Co-Authors: Viridiana Evangelista, Brenda Acosta, Serguei Miridonov, Elena Smolentseva, Sergio Fuentes, Andrey Simakov

    Abstract:

    Highly catalytically active yolk–shell Au-CeO2@ZrO2 nanoreactors (gold core encapsulated into porous zirconia shell and doped by ceria) for the 4-nitrophenol reduction to 4Aminophenol were synthesized. Au cores encapsulated into SiO2 (Au@SiO2) were decorated with ceria via injection of ceria precursor into a void space of silica shell (formed through surface-protected etching of silica by hot water) with its subsequent hydrolysis and thermal treatment (Au-CeO2@SiO2). Au-CeO2@ZrO2 nanoreactors were obtained using Au-CeO2@SiO2 as a template and replacement of SiO2 by ZrO2. The nanoreactors were characterized by STEM-EDS, in situ and ex situ UV–vis spectroscopy, and N2 thermal adsorption. The catalytic activity for decorated Au-CeO2@ZrO2 nanoreactors in the 4-nitrophenol reduction into 4Aminophenol was found to be ∼3 times higher than for non-decorated Au@ZrO2 nanoreactors. The herein proposed route of nanoreactor core decoration may be applied for the synthesis of nanoreactors with cores modified with different materials in order to make them effective for different catalytic reactions.

  • Highly active Au-CeO2@ZrO2 yolk–shell nanoreactors for the reduction of 4-nitrophenol to 4Aminophenol
    Applied Catalysis B-environmental, 2014
    Co-Authors: Viridiana Evangelista, Brenda Acosta, Serguei Miridonov, Elena Smolentseva, Sergio Fuentes, Andrey Simakov

    Abstract:

    Highly catalytically active yolk–shell Au-CeO2@ZrO2 nanoreactors (gold core encapsulated into porous zirconia shell and doped by ceria) for the 4-nitrophenol reduction to 4Aminophenol were synthesized. Au cores encapsulated into SiO2 (Au@SiO2) were decorated with ceria via injection of ceria precursor into a void space of silica shell (formed through surface-protected etching of silica by hot water) with its subsequent hydrolysis and thermal treatment (Au-CeO2@SiO2). Au-CeO2@ZrO2 nanoreactors were obtained using Au-CeO2@SiO2 as a template and replacement of SiO2 by ZrO2. The nanoreactors were characterized by STEM-EDS, in situ and ex situ UV–vis spectroscopy, and N2 thermal adsorption. The catalytic activity for decorated Au-CeO2@ZrO2 nanoreactors in the 4-nitrophenol reduction into 4Aminophenol was found to be ∼3 times higher than for non-decorated Au@ZrO2 nanoreactors. The herein proposed route of nanoreactor core decoration may be applied for the synthesis of nanoreactors with cores modified with different materials in order to make them effective for different catalytic reactions.

Safia Ahmed – One of the best experts on this subject based on the ideXlab platform.

  • Degradation of 4Aminophenol by newly isolated Pseudomonas sp. strain ST-4
    Enzyme and Microbial Technology, 2005
    Co-Authors: Sumera Afzal Khan, Muhammad Hamayun, Safia Ahmed

    Abstract:

    Aromatic compounds and their substituted forms are hazardous to the environment. Biodegradation by microorganisms can be used to remove these pollutants from soil and water. During the present investigations, Pseudomonas sp. strain ST-4 was used for the degradation of 4Aminophenol. The strain was able to use 4Aminophenol as growth substrate showing growth up to 400 ppm on mineral salt media plates. In broth, degradation up to 84% was observed. Induction with 4Aminophenol proved to be effective as it increased the degradation rate more than by the uninduced cell. Biodegradation was found to be more effective than autoxidation of 4Aminophenol, indicating bioremediation as main process to eliminate aromatic amines. In order to locate the responsible genes for degradation, curing and then isolation of plasmid showed the involvement of plasmid encoded genes in this mechanism since the cured strains do not grow with 4Aminophenol.

  • Isolation and characterization of a Pseudomonas strain that degrades 4-acetamidophenol and 4Aminophenol
    Biodegradation, 2001
    Co-Authors: Safia Ahmed, M. Afzal Javed, Shazia Tanvir, Abdul Hameed

    Abstract:

    Though many microorganisms that are capable of using phenol as sole sourceof carbon have been isolated and characterized, only a few organisms degradingsubstituted phenols have been described to date. In this study, one strain ofmicroorganism that is capable of using phenol (3000 ppm), 4Aminophenol(4000 ppm) and 4-acetamidophenol (4000 ppm) as sole source of carbon andenergy was isolated and characterized. This strain was obtained by enrichmentculture from a site contaminated with compounds like 4-acetamidophenol,4Aminophenol and phenol in Pakistan at Bhai Pheru. The contaminated siteis able to support large bacterial community as indicated by the viable cellcounts (2 × 10^4–5 × 10^8) per gram of soil. Detailed taxonomic studies identified the organisms as Pseudomonas species designated as strain STI. The isolate also showed growth on other organic compounds like aniline, benzene, benzyl alcohol, benzyl bromide, toluene, ρ-cresol, trichloroethylene and o -xylene. Optimum growth temperature and pH were found to be 30 °C and 7, respectively, while growth at 4, 25 and 35 °C and at pH 8 and 9 was also observed. Non growing suspended cells of strain ST1 degraded 68, 96 and 76.8% of 4Aminophenol (1000 ppm), phenol (500 ppm) and 4-acetamidophenol (1000 ppm), respectively, in 72 hrs. The isolation and characterization of Pseudomonas speciesstrain ST1, may contribute to efforts on phenolic bioremediation, particularly in anenvironment with very high levels of 4-acetamidophenol and 4Aminophenol.

Maarit Karppinen – One of the best experts on this subject based on the ideXlab platform.

  • Organic–Inorganic Thin Films from TiCl4 and 4Aminophenol Precursors: A Model Case of ALD/MLD Hybrid‐Material Growth?
    European Journal of Inorganic Chemistry, 2014
    Co-Authors: Pia Sundberg, Maarit Karppinen

    Abstract:

    Invited for the cover of this issue are Pia Sundberg and Maarit Karppinen from the Aalto University, Finland. The cover image shows the deposition cycle of a (Ti–O–C6H4–N=)n-type thin film grown by a combined atomic and molecular layer deposition (ALD/MLD) technique with TiCl4 and 4Aminophenol as precursors.

  • mixing ald mld grown zno and zn 4 Aminophenol layers into various thin film structures
    Dalton Transactions, 2013
    Co-Authors: Pia Sundberg, Anjali Sood, Xuwen Liu, Maarit Karppinen

    Abstract:

    Building 2D inorganic–organic hybrids by combining inorganic and organic constituents with molecular-layer precision is an attractive approach to fabricate novel materials with a tailored combination of properties from both entities. Here we demonstrate the potential of the combined atomic and molecular layer deposition (ALD/MLD) technique for the state-of-the-art synthesis of such materials and to fabricate both homogeneous thin-film mixtures and nanolaminates of ZnO and the Zn-4Aminophenol inorganic–organic hybrid. The thin films are deposited by varying the number of precursor cycles during the depositions. Diethyl zinc and 4Aminophenol (AP) are used as precursors for the Zn–AP hybrid depositions, and diethyl zinc and water for the ZnO depositions. The characterization of the mixed Zn–AP and ZnO films reveals that crystallinity, density, surface roughness, chemical stability, hardness and contact modulus are sensitively altered by even a minor insertion of Zn–AP hybrid into the ZnO structure. Fabrication of Zn–AP + ZnO nanolaminates with different thicknesses of the Zn–AP and ZnO layers provides us with an even better way to control the hardness and contact modulus, and also to enhance the chemical stability of the films.

  • Mixing ALD/MLD-grown ZnO and Zn-4Aminophenol layers into various thin-film structures.
    Dalton Transactions, 2013
    Co-Authors: Pia Sundberg, Anjali Sood, Xuwen Liu, Maarit Karppinen

    Abstract:

    Building 2D inorganic–organic hybrids by combining inorganic and organic constituents with molecular-layer precision is an attractive approach to fabricate novel materials with a tailored combination of properties from both entities. Here we demonstrate the potential of the combined atomic and molecular layer deposition (ALD/MLD) technique for the state-of-the-art synthesis of such materials and to fabricate both homogeneous thin-film mixtures and nanolaminates of ZnO and the Zn-4Aminophenol inorganic–organic hybrid. The thin films are deposited by varying the number of precursor cycles during the depositions. Diethyl zinc and 4Aminophenol (AP) are used as precursors for the Zn–AP hybrid depositions, and diethyl zinc and water for the ZnO depositions. The characterization of the mixed Zn–AP and ZnO films reveals that crystallinity, density, surface roughness, chemical stability, hardness and contact modulus are sensitively altered by even a minor insertion of Zn–AP hybrid into the ZnO structure. Fabrication of Zn–AP + ZnO nanolaminates with different thicknesses of the Zn–AP and ZnO layers provides us with an even better way to control the hardness and contact modulus, and also to enhance the chemical stability of the films.